Attachment for printing-presses.



1. E. DOYLE.

ATTACHMENT FOR PRINTING PRESSES.

vAPPLICATION FILED MAY I9, 1914.

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JAMES E. DOYLE, OF CLEVELAND, OHIO.

ATTACHMENT rola` PRINTING-PRESSES.

Specification of Letters Patent.

. Patented Dec. 21,1915.

Application led May 19, 1914. Serial No. 839,514.

To all w kom t may concern.'

Be it known that I, lJAMEs E. DOYLE, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a new and useful Improvement in Attachments for Printing-Presses, of which the following isA va specification, the principle of the invention being herein explained and thevbest mode in which I .have contemplated applying that principle, so as to distinguish it from other inventions.

' yThis invention termed an attachment for printing presses'is more particularly a limiting device for use in conjunction with a yCrordon type of press in which a platen is caused to swing'toward and away from the type-form.

Those engaged'in the art of printing have found it to be very diiiicult, indeedv fre. quently impossible to produce an impression of uniform color intensity over the entire area of the form. This circumstance is owing to an imparting of various degrees of pressure at different points of contact between the platen and type-form. Such variation in pressure is `due either to faulty .manufactura to inaccurate vmounting or to an excessively developed loose play of the The latter of these possible causes is the most factor of imperfection which I have succeeded in overcoming.

Accordingly, my object has been to effect a simultaneous contact throughout the area of the type-form and this I have accomplished by arranging for an independent contact between the platen and bed-frame. In other words, the surface of the form is not of itself intended to terminate the range of approach of the platen. With the aid amongelse of adjusting means I am enabled to shim up the plane of advance of the platen until it lies parallel with the surface of the type-form and thereby consistently obtain long sought results.

The inventive conception is associated with vmeans which are hereinafter explainedand variously combined in the claims. While the annexed drawing and particular description thereof, set forth in detail the preferred form embodying my invention, it should be understood that the means only exemplify some of the many diversified mechanical forms with which the principle of my invention `may be justly applied.

likely to beresponsible and is the` Adver-ting to the single sheet of drawing: Figure I is a part section part elevation of a portion of a Gordon type of press showing the platen in position adjacent the typeform and having my invention associated therewith. Fig.` II is a mainly horizontal section of Fig. I on an enlarged scale. Fig.` III is a perspective view of lmy inventive type of platen. y

A portion of the frame A along the forward edge of which the saddle which carries the inking rollers is adapted to reciprocate, is seen in Fig. I. A pair of brackets a are included in such frame and their forward surfaces@2 together form a track upon which the saddles actually roll back and forth. That portion of the frame A which has been shown is formed in the usual manner with a recessed surface known as the bed. f

A chase B of any approved form is adapted to snugly fit against the bed c3, as shown in Figs. I and II. An insert member b is in turn adapted to snugly fit and be removable from the chase B. This insert member b itself supports the form b2 in which a group vof selected type b3 are mounted. The end or impressing surfaces of the type I have designated with the reference characters b4. n

A rocker C, shown in both Figs. I and II,

carries the platen c and is so mounted as to be capable of causing the latter to swing f toward and away from the type-form. It

has not been deemed necessary to illustrate the precise manner in which the rocker C is operatively connected with the press since this is well known to the art and since furthermore nothing whatsoever is claimed in reference thereto. Extending through each of the opposite lateral ends of the platen c are a pair of screw-threaded openings c3, the purpose of which will hereinafter appear. The forward plain surface of the platen I have identified as c2. A pad X, usually of cardboard, is shown aiixed to the surface c2.k It is against this padding that the paper stock Y is in brackets held through thek agency of a pair of oscillating gripper arms Z. These gripper arms appear in Fig. II, and since the `manner in -which movement is imparted to them is likewise old, the mode in which they are operatively secured to the press has not been disclosed. It is this surface which has in the past to the best of my knowledge always f yhad the extent of its approach toward,` and hence.' its degree of` pressurev as imparted o 'through the padding Xvand paper stock Y and against the type-form finally prescribed l :by some portion of the surface Tof Vthe lat-H ter. In'. assembling the press, the 'attempt f l was always made to line upthe surfaces 64 and *surfacecA2 as'accurately as possible. While 'such attempt was frequently'successf ful; the nicety of adjustment thus accom@ plished was notmaintained after vthev press had-been putin operation, with the result that in due timeeven veryslight disaline' ments, usually on the part of the platen *with 'respect to the,typeform,'V became at oncel'noticeable in the character ofthe impressionswhich were produced. This manie 'festation consisted in' variations in fthe in- *o tensity of the ink over 4different portions of yapplied to the areas showing the heaviesty series and in'thisinstance with three screws* vthe impressionsvand this wasv of course directly due to greater .pressure having been inksupply. A v.

l/Vith the foregoing in mind the utility of the especial feature of my invention'to be now described, will be readily understood.

I attach'apair of bearing bars D along opp ositef side ends" of the surface 02 respec-4 tively. The attachment of the bars D 'to' lthe platen c rmay be edected by means of a i 'd'5 as clearly seen in FigfIII. I have pur- 'Jposed'to vhave the two bearing bars D` adjustably l*mounted to: regulate the advance of.v the platen by having-them 'contact directly with thel frame `A and specifically with the surfaces t2 thereof. Aiccordinglyyinstead-of' having to alinethevplaneoffthe surface c2 f I am able to adjust the planes ofthe bars D with respectqtheretountilv the finished advance surfaces ofthe bars so limit the effec.`

tivepr'esentation of the paper stockl to the type-form aswill insure an absolutely unistrips d2 depending uponv existing requirement. l I vhave furthermore provided set screwsl Zavadaptedf for/insertionl into the screw .threaded openings c? and vsupplied f incassa with additional' 160k' 'nuts' a4. when' a is desired to adjust one of the` bars D the.v

screws aly are to: be first` loosened, neXt one or more ,adjusting` strips Z2 either addedor .removed and finally the set screws als adjusted tocompensate for the desired altered position of the bar D after which the screws r' Z maybe again" tightened.

`My invention ybeing thus described with' sufficient thoroughness, 'what I desire to secure-,by Letters Patent and specifically, is: 'i

l. An attachment for' printing pressesl comprising inl combinatiomoa bracket having a 'pair of fiat edge surfaces,-a=typeeform supported therebetween; a platen', .means for ymovin'gsaid platen relative tosaid form,"

and pair of fiat bearing bars adjustably' carried by said platen andadapted to abut therefore `claim o said surfaces respectively along-their 'enj* tire length, and set screws for variously efn fecting the adjustment of vsaid bars with reference to the plane of said platen' whereo byy to .limit the approach of vsaid platen to-y 2.V An attachment for' printing presses` comprising in combinatiomfa frameya typef lform supported thereby,v a platen, vmeansfor moving said platen relative'to saidform;y a

pair'` ofl elongated bearing-bars supported alongoppositeside edges :of said platen;`

,saidbars being adapted to engage said frame,` and means Vfor independently'iadjusting different portions `of vsuch bars vrelative to said specifiedf y l l3. attachment for printing presses of a frameprovidedalong opposite sides with r platen for'v theuseful purpose ythe Gordon type comprising in combination,

fiat tracks, a ltype-form supported between said tracks, a platen, means l-for oscillating-f o said platen relative to. saidl form,` apa-ir' of elongated bearing'bars vsupported along op positesidefedges of said platen and'simiadapted to lengage said frame, and distinct e means for independently adjusting opposite'k -en'dsfof each y'of said `bars relative l'to said platen.

'-Attested by*n Y l WILLIAM(y L. DOYLE, y' r JAMES-A. MARTIN..Y

` "TMSiE-DOYLE- i i Copies this Vpatent may be obtained for ive cents each, by addressing the Confun-issiener of Patents, y washingtomn C.u Y' ff v f 1to0 f `larly spaced assaid tracks, said bars being f 

